scholarly journals Some Considerations on Electronic Energy of Itinerant-electron Metamagnetic Materials with Volume-dependent Exchange Energy

2001 ◽  
Vol 24 (1) ◽  
pp. 63-67 ◽  
Author(s):  
M. A. Grado-Caffaro ◽  
M. Grado-Caffaro ◽  
S. L. Sapienza
Keyword(s):  
Electronic Energy ◽  
Exchange Energy ◽  
Itinerant Electron ◽  
Average Value

Electronic energy of itinerant-electron metamagnetic materials is examined by taking into consideration volume-dependent exchange energy between up and down spin electrons. In particular, the average value of the electronic energy is formulated in terms of the energy bandwidth which is closely related to volume; from the above average value, the average value of the exchange energy may be evaluated.

scholarly journals A Brief Study on Energy in Itinerant-Electron Metamagnetic Materials at Very Low Temperature

1997 ◽  
Vol 20 (2) ◽  
pp. 91-94
Author(s):  
M. A. Grado-Caffaro ◽  
M. Grado-Caffaro
Keyword(s):  
Low Temperature ◽  
Total Energy ◽  
Density Of States ◽  
Electronic Energy ◽  
Itinerant Electron ◽  
Very Low Temperature

Electronic energy is calculated explicitly for itinerant-electron metamagnetic materials at very low temperature. This calculation involves bandwidth and consequently volume, and it has been performed by means of an elliptic density of states. Moreover, total energy is considered.

scholarly journals Electronic Energy in Itinerant-Electron Metamagnetism

1994 ◽  
Vol 17 (3) ◽  
pp. 177-178 ◽  
Author(s):  
M. A. Grado Caffaro ◽  
M. Grado Caffaro
Keyword(s):  
Density Of States ◽  
Electronic Energy ◽  
Itinerant Electron

Electronic energy in the context of itinerant-electron metamagnetism is considered in a new way. In particular, the minimal value of this energy is calculated within the Stoner model. To get this end, an elliptic density of states is used.

scholarly journals Exchange interaction in itinerant-electron metamagnetism

2018 ◽  
Vol 39 (1) ◽  
pp. 31-34
Author(s):  
M. A. Grado-Caffaro ◽  
M. Grado-Caffaro
Keyword(s):  
Magnetic Field ◽  
Matrix Element ◽  
Exchange Interaction ◽  
Hamiltonian Operator ◽  
Electronic Energy ◽  
Itinerant Electron ◽  
Multiplicative Constant ◽  
Absolute Value ◽  
The Matrix ◽  
The Difference

Abstract The exchange interaction in itinerant-electron metamagnetism is investigated theoretically. In fact, by considering spin-up and spin-down electrons in an itinerant-electron metamagnetic gas in the presence of an external magnetic field, we show that the difference between the Fermi energies of the spin-up and spin-down electrons equals, up to a multiplicative constant, the absolute value of the matrix element of the Hamiltonian operator relative to the interaction in question. Furthermore, the Stoner formula for the electronic energy of the gas is used to study the size of the exchange interaction.

Mathematical–Physics Investigation on the Behaviour of a Metamagnetic System

2017 ◽  
Vol 72 (5) ◽  
pp. 463-467 ◽  
Author(s):  
M.A. Grado-Caffaro ◽  
M. Grado-Caffaro
Keyword(s):  
Magnetic Susceptibility ◽  
Energy Eigenvalue ◽  
Mathematical Physics ◽  
Electronic Energy ◽  
Absolute Temperature ◽  
Itinerant Electron ◽  
Eigenvalue Spectrum ◽  
Matrix Formulation ◽  
Band Energy ◽  
Key Aspects

AbstractIn order to exemplify, we consider a finite itinerant-electron metamagnetic gas at sufficiently low absolute temperature so that relevant new results are obtained. In fact, we study key aspects related to derive the electronic energy of the abovementioned metamagnetic gas in relation to the Fermi levels of the spin-up and spin-down electron bands and in relation to the exchange energy and magnetic susceptibility. Within an unprecedented mathematical–physics approach, the abovementioned electronic energy is reinterpreted by defining it as an averaged quantity from the corresponding nonrelativistic, time-independent, Schrödinger equation with two-band energy-eigenvalue spectrum. In parallel, a matrix formulation is presented.

The Average Value of Electronic Energy during Dielectric Ageing of Polymeric Solid Insulators under HVAC Stress

2011 ◽  
Author(s):  
Peris G. Halaris ◽  
John S. Katsanis ◽  
George K. Soulinaris ◽  
John D. Koustellis ◽  
Aikaterini D. Polykrati
Keyword(s):  
Electronic Energy ◽  
Average Value ◽  
Polymeric Solid

Calculation of exchange energy in quantum dots : application to porous silicon

1993 ◽  
Vol 03 (C5) ◽  
pp. 355-358 ◽  
Author(s):  
G. FISHMAN ◽  
R. ROMESTAIN ◽  
J. C. VIAL
Keyword(s):  
Quantum Dots ◽  
Porous Silicon ◽  
Exchange Energy

Implementasi Pembelajaran Kontekstual berpendekatan Learning Community pada Bidang Studi Fiqh dalam Meningkatkan Motivasi dan Prestasi Belajar Siswa MI Mambaul Hidayah Mengelo Sooko Mojokerto

2018 ◽  
Vol 1 (2) ◽  
pp. 57
Author(s):  
Masadah Masadah
Keyword(s):  
Learning Community ◽  
Descriptive Analysis ◽  
Visual Presentation ◽  
Contextual Learning ◽  
Learning Motivation ◽  
Human Beings ◽  
Action Execution ◽  
Average Value ◽  
Community Approach ◽  
Motivation And Achievement

Education is a conscious and systematic effort not only to humanize human beings but also for human beings to realize their position as khalifatullah fil ardhi, which in turn will increasingly increase itself to be a pious, faithful, knowledgeable and virtuous man. In general the problems formulated in this research is whether Implementation of Contextual Learning with Learning Community approach can improve student's motivation and achievement in FIQH study field? How Implementation of Contextual Learning has a Learning Community approach that can improve students' motivation and achievement in FIQH? Field. This research was conducted in Mojokerto Regency, precisely at MI Mambaul Hidayah Mengelo Sooko Mojokerto. This research is a classroom action research with collaborative type. This research phase follows a model developed by Kemmis and Taggart, which is a spiral cycle that includes planning activities, action execution, observation, and reflection. The data collection techniques used are: (1) observation; (2) measurement of learning result test; and (3) documentation. Data obtained from the action are then analyzed. Qualitative data consisting of observation and documentation are analyzed qualitatively, while data collected in the form of numbers or quantitative data, simply by using descriptive analysis and visual presentation. Based on the results of research that has been implemented can be concluded that the Implementation of Contextual Learning with Learning Community approach can improve student's motivation and achievement in the field of FIQH study. From the data in the field shows that there is an increase in student learning motivation that the initial average value of pre-test of 20 increased to 24 or about 20% in cycle I, in cycle II more increased to 31 or about 55%, and in cycle III the more increased to 45 or about 125%. Level of increase between cycle I with cycle II about 29%, between cycle II with cycle III about 45%, between cycle III with cycle I about 87%. With the increase of students' learning motivation, their learning achievement also increased, whereas the average value of pre test of 6.60 increased to 6.84 or about 4% in cycle I, in cycle II more increased again to 7.75 or about 17 %, and in cycle III it increases to 8.80 or about 35%. The level of improvement between cycle I with cycle II is about 13%, between cycle II with cycle III about 15%, between cycle III with cycle I about 30%.

KOMPETENSI PEDAGOGIK GURU

2012 ◽  
Vol 10 (3) ◽  
Author(s):  
Achmad Habibullah
Keyword(s):  
Civil Servant ◽  
Lesson Plans ◽  
Islamic Education ◽  
Weak Point ◽  
Islamic School ◽  
Average Value ◽  
Central Java ◽  
Potential Development ◽  
Pedagogical Competence ◽  
Material Organization

AbstractPedagogical competence is one of important competencies to the teachers. Therefore, this study aims to determine how the pedagogical competence of teachers is, viewed from the aspects of learning know­ledge skills, preparation of lesson plans, and learning in the classroom. This study used the quantitative method with 631 respondents of civil servant teachers of Islamic Education at school and teachers of ge­neral subjects at madrasah (Islamic school) recruited from non-permanent teachers in 20 districts/cities in Central Java province, selected at random. The findings show that teachers’ pedagogical competence knowledge on the aspect of learning knowledge skills is in the “poor” category, the aspect of students’ potential development knowledge and reflective efforts to improve the learning quality becomes a very weak point at an average value with the “very poor” category. In addition, the aspect of ability to prepare lesson plans is in the “sufficient” category, the teaching material organization and the evaluation aspect are very weak competence aspects, which get “poor”. Meanwhile, the competence of learning implemen­tation aspect is in the “sufficient” category. AbstrakKompetensi pedagogik merupakan salah satu kompetensi yang penting bagi guru. Untuk itu, penelitian ini bertujuan untuk mengetahui bagaimana kompetensi pedagogik guru, dilihat dari aspek kemampuan pengetahuan pembelajaran, menyusun rancangan pembelajaran (RPP), dan pembelajaran di kelas. Penelitian ini menggunakan metode kuantitatif dengan responden 631 guru PNS Pendidikan Agama Islam pada sekolah dan guru mata pelajaran umum pada madrasah yang direkrut dari guru honorer di 20 Kabupaten/Kota di Provinsi Jawa Tengah yang dipilih secara random. Hasil penelitian menunjukkan bahwa kompetensi pedagogik guru pada aspek kemampuan pengetahuan pembelajaran dalam kategori “kurang”, aspek pengetahuan pengembangan potensi peserta didik dan upaya reflektif untuk meningkatkan mutu pembelajaran menjadi titik yang sangat lemah dengan mendapat nilai rata-rata dengan kategori “sangat kurang”. Selain itu, aspek kemampuan menyusun RPP dalam kategori “cukup”, aspek pengorganisasian materi ajar dan aspek evaluasi merupakan aspek kemampuan yang sangat lemah dengan mendapatkan nilai “kurang”. Sedangkan, aspek kemampuan dalam melaksanakan pembelajaran dalam kategori “cukup”.

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